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The Kyshtym disaster is the third-worst nuclear accident ever recorded.
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Kyshtym disaster
1957 radiological contamination disaster in the Soviet Union
The Kyshtym disaster,, sometimes referred to as the Mayak disaster or Ozyorsk disaster in newer sources, was a radioactive contamination accident that occurred on 29 September 1957 at Mayak, a plutonium reprocessing production plant for nuclear weapons located in the closed city…Source: Wikipedia (CC BY-SA)
Nuclear and radiation accidents and incidents
Severe disruptive events involving fissile or fusile materials
A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include lethal effects to individuals, large radioactivity release to the…Source: Wikipedia (CC BY-SA)
September 29
Day of the year
September 29 is the 272nd day of the year in the Gregorian calendar; 93 days remain until the end of the year.Source: Wikipedia (CC BY-SA)